Compilare: main.cpp: In function 'long long int solve1()': main.cpp:25:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | for(int y = 0 ; y < m[start].size() ; y++){ | ~~^~~~~~~~~~~~~~~~~ main.cpp: In function 'int solve2()': main.cpp:48:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 48 | for(int y = 0 ; y < m[v].size() ; y++){ | ~~^~~~~~~~~~~~~