Compilare: main.cpp: In function 'void solution()': main.cpp:40:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 40 | for(int i = 0; i < nx.size(); ++ i) | ~~^~~~~~~~~~~ main.cpp:43:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 43 | for(int i = 0; i < ny.size(); ++ i) | ~~^~~~~~~~~~~ main.cpp:46:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | for(int i = 1; i < nx.size(); ++ i) | ~~^~~~~~~~~~~ main.cpp:47:26: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | for(int j = 1; j < ny.size(); ++ j) | ~~^~~~~~~~~~~ main.cpp:58:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 58 | for(int i = 1; i < nx.size(); ++ i) | ~~^~~~~~~~~~~ main.cpp:59:26: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 59 | for(int j = 1; j < ny.size(); ++ j) | ~~^~~~~~~~~~~ main.cpp:64:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | for(int i = 1; i < nx.size(); ++ i) | ~~^~~~~~~~~~~ main.cpp:66:26: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | for(int j = 1; j < ny.size(); ++ j) | ~~^~~~~~~~~~~ main.cpp:72:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 72 | for(int i = 1; i < nx.size(); ++ i) | ~~^~~~~~~~~~~ main.cpp:74:26: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 74 | for(int j = 1; j < ny.size(); ++ j) | ~~^~~~~~~~~~~