Compilare: main.cpp: In function 'int main()': main.cpp:98:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 98 | for(i = 0; i < newvec.size(); i++) | ~~^~~~~~~~~~~~~~~ main.cpp:101:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 101 | for(j = 0; j < newmat[i].size(); j++){ | ~~^~~~~~~~~~~~~~~~~~ main.cpp:37:15: warning: iteration 999999 invokes undefined behavior [-Waggressive-loop-optimizations] 37 | if(f[i]) | ~~~^ main.cpp:36:18: note: within this loop 36 | for(i = 1; i <= 1000000; i++) | ~~^~~~~~~~~~