Compilare: main.cpp: In function 'int pairup(int)': main.cpp:37:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | for(i = 0; i < v[u].size(); i++) | ~~^~~~~~~~~~~~~ main.cpp:47:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | for(i = 0; i < v[u].size(); i++) | ~~^~~~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:68:22: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 68 | for(j = 0; j < strlen(s); j++) | ~~^~~~~~~~~~~