foo.cc: In function 'int main()':
foo.cc:16:5: error: 'map' was not declared in this scope
     map<int,int> priceAndCha;
     ^~~
foo.cc:16:9: error: expected primary-expression before 'int'
     map<int,int> priceAndCha;
         ^~~
foo.cc:17:9: error: expected primary-expression before 'int'
     map<int,int> priceAndProfit;
         ^~~
foo.cc:18:13: error: redeclaration of 'int Salenum'
     int i=0,Salenum=priceAndSalenum[1];
             ^~~~~~~
foo.cc:6:31: note: 'int Salenum' previously declared here
     int priceGovernment,price,Salenum,cutPerYuan;
                               ^~~~~~~
foo.cc:22:9: error: 'priceAndProfit' was not declared in this scope
         priceAndProfit[priceAndProfit[i]]=profit;
         ^~~~~~~~~~~~~~
foo.cc:9:30: warning: unused variable 'maxProfitPrice' [-Wunused-variable]
     int maxProfit=0,profit=0,maxProfitPrice=0;
                              ^~~~~~~~~~~~~~