#include<cstdio>
int main() {
    int n, k=0, s=0;
    scanf("%d", &n);
    while(n>s) {
        k++;
        s+=k;
    }
    if(k%2==1)
        printf("%d/%d",s-n+1,k+n-s);
    else
        printf("%d/%d",k+n-s,s-n+1);
    return 0;
}

    #include<iostream>
    #include<cmath>
    using namespace std;
    int main(){
        long long l=1,r,mid,n,a;
        cin>>n;
        r=n;
        while(l<r){
            mid=(l+r)/2;
            if(mid*(mid+1)/2<n)l=mid+1;
            else r=mid;
        }
        a=n-l*(l-1)/2;
        if(l%2==0)cout<<a<<'/'<<l+1-a;
        else cout<<l+1-a<<'/'<<a;
        return 0;
}

#include<bits/stdc++.h>
using namespace std;
int main()
{
int n,k=1;
cin>>n;
while(n>k)
{
n=n-k;
k++;
}
if(k%2==0)
cout<<n<<"/"<<(k+1-n);
else
cout<<k+1-n<<"/"<<n;
}

国服亚索又回来了！！！
var
n,i,j:longint;
begin
read(n);
i:=0;j:=n;
repeat
inc(i);
j:=j-i;
until j<=0;
j:=j+i;
if i mod 2=0 then writeln(j,'/',i+1-j)
else writeln(i+1-j,'/',j);
end.

a=int(input());
for i in range(1,1000000):
    if i>=a:h=i;h+=1;break;
    else:a-=i;
if h%2!=0:print(a,'/',h-a,sep='');
else:print(h-a,'/',a,sep='');

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <cstring>
#include <algorithm>
using namespace std;
int main()
{
    int i,n,j=1,all=0,k;
    scanf("%d",&n);
    for(i=1;;i++)
    {
        j=i%2;
        if(all+i<=n)
            all+=i;
        else
        {
            k=n-all;
            if(k==0)
                k++,i--;
            j++;
            if(j==1)
            {
                printf("%d/%d",k,i+1-k);
            }
            else
            {
                printf("%d/%d",i+1-k,k);
            }
            return 0;
        }
    }
    return 0;
}

哈哈 还是比较简单的，还是容易理解的吧

#include<stdio.h>
int main()
{
int n;
scanf("%d",&n);
int i;
int sum = 0;
for(i=1; i < 5000; i++)
{
sum += i;
if(n <= sum)
{
if(i%2 == 0) printf("%d/%d",i-(sum-n),sum-n+1 );
else printf("%d/%d",sum-n+1,i-sum+n);
break;
}
}
return 0;

}

#include<stdio.h>
int main(void)
{
int i,j,k;
int x,y;
int n;
scanf("%d",&n);
for(i=1;i<10000;i++)
{
if(((i-1)*i)<2*n&&2*n<=(i*(i+1)))
{
j=i;
}
}
if(j%2==0)
{
k=((j-1)*j)/2;
x=n-k;
y=j+1-x;
}
else
{
k=((j-1)*j) /2;
y=n-k;
x=j+1-y;
}
printf("%d/%d",x,y);
return 0;
}

so easy~~~
pascal
var
n, i, j:longint;
begin
read(n);
i:=1;
j:=1;
while n-i>0 do begin
inc(j);
dec(n, i);
inc(i)
end;
if odd(j) then write(j-n+1, '/', n)
else write(n, '/', j-n+1)
end.


真水题
var
n,i,s:longint;
begin
readln(n);
for i:=1 to n do
begin
s:=s+i;
if s>=n then
begin
s:=s-i;
break;
end;
end;
if i mod 2=0 then
write(n-s,'/',i+1-n+s)
else write(i+1-n+s,'/',n-s);
end.

哎……
c++
#include <bits/stdc++.h>
using namespace std;
string a[1001][1001];
int main()
{
int i,j,k,l,n,m,x,y;
cin>>n;
x=y=1;
bool flag=true;
for(;n>1;n--){
if(!flag)
if(y-1) x++,y--;
else x=x+1,flag=true;
else
if(x-1) x--,y++;
else y=y+1,flag=false;
}
cout<<x<<"/"<<y<<endl;
return 0;
}


可爱的万呆呆

#include <stdio.h>
int main (){
int n;
scanf ("%d",&n);
int i=1,sum=1;
while (sum<n)
{i++;sum+=i;}
sum-=i;n-=sum;
if (i%2==0) {printf ("%d/%d",n,i+1-n);}
else {printf ("%d/%d",i+1-n,n);}
return 0;
}

第一次没注意到是之字形。。。我去。。。还以为都是右上往左下标。。。
之字形也好，就是判一下奇偶。。
###BlockCode
program vijos1333;
var n,x,d:longint;
begin
readln(n);
x:=0;
repeat
inc(x)
until x*(x+1)div 2 >=n;
d:=n-((x*x-x+2)div 2);
if x mod 2=0 then writeln(1+d,'/',x-d)
else writeln(x-d,'/',1+d);
readln
end.

C语言
已AC话说为什么大家在vijos上写题解都要注明已AC嘞= = 算了我就入乡随俗吧……

第i行有i个元素。
奇数行i从左下到右上，第j个的值为(i-n+1)/n ;
偶数行i从右上到左下，第j个的值为n/(i-n+1)。
#include <stdio.h>
#include <stdlib.h>
int main()
{
int n,i=1;
scanf("%d",&n);
while(n-i>0)
{
n-=i;
i++;
}
if(i%2!=0)
{
printf("%d/%d", (i-n+1), n);
}
else
printf("%d/%d", n, (i-n+1));
return 0;
}

P1333Cantor表Accepted
记录信息
评测状态 Accepted
题目 P1333 Cantor表
递交时间 2015-08-14 21:34:32
代码语言 C++
评测机 VijosEx
消耗时间 8 ms
消耗内存 532 KiB
评测时间 2015-08-14 21:34:33
评测结果
编译成功

测试数据 #0: Accepted, time = 1 ms, mem = 532 KiB, score = 20
测试数据 #1: Accepted, time = 7 ms, mem = 528 KiB, score = 20
测试数据 #2: Accepted, time = 0 ms, mem = 528 KiB, score = 20
测试数据 #3: Accepted, time = 0 ms, mem = 532 KiB, score = 20
测试数据 #4: Accepted, time = 0 ms, mem = 532 KiB, score = 20
Accepted, time = 8 ms, mem = 532 KiB, score = 100
代码
#include <iostream>
#include <stdio.h>
using namespace std;
int 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6021,8030028,8034036,8038045,8042055,8046066,8050078,8054091,8058105,8062120,8066136,8070153,8074171,8078190,8082210,8086231,8090253,8094276,8098300,8102325,8106351,8110378,8114406,8118435,8122465,8126496,8130528,8134561,8138595,8142630,8146666,8150703,8154741,8158780,8162820,8166861,8170903,8174946,8178990,8183035,8187081,8191128,8195176,8199225,8203275,8207326,8211378,8215431,8219485,8223540,8227596,8231653,8235711,8239770,8243830,8247891,8251953,8256016,8260080,8264145,8268211,8272278,8276346,8280415,8284485,8288556,8292628,8296701,8300775,8304850,8308926,8313003,8317081,8321160,8325240,8329321,8333403,8337486,8341570,8345655,8349741,8353828,8357916,8362005,8366095,8370186,8374278,8378371,8382465,8386560,8390656,8394753,8398851,8402950,8407050,8411151,8415253,8419356,8423460,8427565,8431671,8435778,8439886,8443995,8448105,8452216,8456328,8460441,8464555,8468670,8472786,8476903,8481021,8485140,8489260,8493381,8497503,8501626,8505750,8509875,8514001,8518128,8522256,8526385,8530515,8534646,8538778,8542911,8547045,8551180,8555316,8559453,8563591,8567730,8571870,8576011,8580153,8584296,8588440,8592585,8596731,8600878,8605026,8609175,8613325,8617476,8621628,8625781,8629935,8634090,8638246,8642403,8646561,8650720,8654880,8659041,8663203,8667366,8671530,8675695,8679861,8684028,8688196,8692365,8696535,8700706,8704878,8709051,8713225,8717400,8721576,8725753,8729931,8734110,8738290,8742471,8746653,8750836,8755020,8759205,8763391,8767578,8771766,8775955,8780145,8784336,8788528,8792721,8796915,8801110,8805306,8809503,8813701,8817900,8822100,8826301,8830503,8834706,8838910,8843115,8847321,8851528,8855736,8859945,8864155,8868366,8872578,8876791,8881005,8885220,8889436,8893653,8897871,8902090,8906310,8910531,8914753,8918976,8923200,8927425,8931651,8935878,8940106,8944335,8948565,8952796,8957028,8961261,8965495,8969730,8973966,8978203,8982441,8986680,8990920,8995161,8999403,9003646,9007890,9012135,9016381,9020628,9024876,9029125,9033375,9037626,9041878,9046131,9050385,9054640,9058896,9063153,9067411,9071670,9075930,9080191,9084453,9088716,9092980,9097245,9101511,9105778,9110046,9114315,9118585,9122856,9127128,9131401,9135675,9139950,9144226,9148503,9152781,9157060,9161340,9165621,9169903,9174186,9178470,9182755,9187041,9191328,9195616,9199905,9204195,9208486,9212778,9217071,9221365,9225660,9229956,9234253,9238551,9242850,9247150,9251451,9255753,9260056,9264360,9268665,9272971,9277278,9281586,9285895,9290205,9294516,9298828,9303141,9307455,9311770,9316086,9320403,9324721,9329040,9333360,9337681,9342003,9346326,9350650,9354975,9359301,9363628,9367956,9372285,9376615,9380946,9385278,9389611,9393945,9398280,9402616,9406953,9411291,9415630,9419970,9424311,9428653,9432996,9437340,9441685,9446031,9450378,9454726,9459075,9463425,9467776,9472128,9476481,9480835,9485190,9489546,9493903,9498261,9502620,9506980,9511341,9515703,9520066,9524430,9528795,9533161,9537528,9541896,9546265,9550635,9555006,9559378,9563751,9568125,9572500,9576876,9581253,9585631,9590010,9594390,9598771,9603153,9607536,9611920,9616305,9620691,9625078,9629466,9633855,9638245,9642636,9647028,9651421,9655815,9660210,9664606,9669003,9673401,9677800,9682200,9686601,9691003,9695406,9699810,9704215,9708621,9713028,9717436,9721845,9726255,9730666,9735078,9739491,9743905,9748320,9752736,9757153,9761571,9765990,9770410,9774831,9779253,9783676,9788100,9792525,9796951,9801378,9805806,9810235,9814665,9819096,9823528,9827961,9832395,9836830,9841266,9845703,9850141,9854580,9859020,9863461,9867903,9872346,9876790,9881235,9885681,9890128,9894576,9899025,9903475,9907926,9912378,9916831,9921285,9925740,9930196,9934653,9939111,9943570,9948030,9952491,9956953,9961416,9965880,9970345,9974811,9979278,9983746,9988215,9992685,9997156,10001628,10006101};
int main()
{
int n;
scanf("%d",&n);
int lo=0;
int hi=4474;
for(;;)
{
int mid=(lo+hi)/2;
if(lo>=hi-1)break;
if(bigger[mid]>=n)
hi=mid;
if(bigger[mid]<=n)
lo=mid;

}
int k=bigger[hi];
int x;
int y;
int rule;
if(hi%2==0)
{
rule=1;
x=hi;
y=1;
}
else
{
rule=-1;
x=1;
y=hi;
}

for(;;)
{
if(k==n)
break;
k--;
x-=rule;
y+=rule;
}
printf("%d/%d",x,y);
}

#include <iostream>
using namespace std;
int main(){
int n;
cin >> n;
int i = 0;
while((n <= i (i + 1)/2) || (n > (i + 1)(i + 2)/2)) i++;
int j = i % 2;
int n1;
int n2;
if( j == 1){
n1 = n - i(i + 1)/2;
n2 = i + 2 - n1;
} else{
n2 = n - i ( i + 1) /2;
n1 = i + 2 - n2;
}
cout << n1 << '/' << n2 << endl;
}

#include <iostream>
using namespace std;

int main(){
int n;
cin >> n;
int i = 0;
while((n <= i * (i + 1)/2) || (n > (i + 1)*(i + 2)/2)) i++;
int j = i % 2;
int n1;
int n2;
if( j == 1){
n1 = n - i*(i + 1)/2;
n2 = i + 2 - n1;
} else{
n2 = n - i * ( i + 1) /2;
n1 = i + 2 - n2;
}
cout << n1 << '/' << n2 << endl;
}

var
a,b:longint;
begin
readln(a);
b:=1;
while a-b>0 do
begin
dec(a,b);
inc(b);
end;
if b mod 2=0 then write(a,'/',b+1-a)
else write(b+1-a,'/',a);
end.

我真傻真的，今天这是怎么了。这么简单还错好几次。
#include<iostream>
#include<string.h>
#include<math.h>
using namespace std;

int main(){
freopen("in.txt", "r", stdin);

long long int n;
cin >> n;

int i;
int sum = 0;
for (i = 1; sum < n; i++)sum += i;
i--;
if (sum == n){
if (i & 1){
cout << 1 << '/' << i << endl;
}
else{
cout << i << '/' << 1 << endl;
}
}
else{
sum -= i;
if (i & 1){
cout << (i+1-(n-sum) ) << '/' << (n - sum);
}
else{
cout << (n - sum) << '/' << (i + 1) - (n - sum) << endl;
}
}
return 0;
}