Compilare: user.cpp: In function ‘void Solve(int, int)’: user.cpp:16:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(sol<=max(Lin[x].size(),Col[y].size())) return; ^ user.cpp:20:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<Lin[x].size() && i<Col[y].size();++i) ans.pb(mp(Lin[x][i],Col[y][i])); ^ user.cpp:20:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<Lin[x].size() && i<Col[y].size();++i) ans.pb(mp(Lin[x][i],Col[y][i])); ^ user.cpp:21:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i==Lin[x].size() && i==Col[y].size()) return; ^ user.cpp:21:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i==Lin[x].size() && i==Col[y].size()) return; ^ user.cpp:22:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i==Lin[x].size()) ^ user.cpp:23:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;i<Col[y].size();++i) ans.pb(mp(Lin[x1][0],Col[y][i])); ^ user.cpp:25:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(;i<Lin[x].size();++i) ans.pb(mp(Lin[x][i],Col[y1][0])); ^