/in/foo.cc: In function 'long long int f1(int)':
/in/foo.cc:22:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int k=0;k<g[i].size();k++)
~^~~~~~~~~~~~
/in/foo.cc: In function 'long long int f2(int)':
/in/foo.cc:37:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int k=0;k<gr[i].size();k++)
~^~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:66:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int k=0;k<g[i].size();k++)
~^~~~~~~~~~~~