Compilare: main.cpp: In function 'int main()': main.cpp:31:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for (i = 0; i<v[1].size(); i++) | ~^~~~~~~~~~~~ main.cpp:54:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 54 | for (j = 0; j<v[x].size(); j++) | ~^~~~~~~~~~~~ main.cpp:17:30: warning: unused variable 'nrsol' [-Wunused-variable] 17 | int n, m, i, j, x, y, z, nrsol; | ^~~~~