Compilare: main.cpp: In function 'int main()': main.cpp:19:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] 19 | for (int i = 2 ; i <= n ; i++) | ^~~ main.cpp:21:9: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for' 21 | c = 0; | ^ main.cpp:35:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | for (int j = 0 ;j < a[i].size() ; j++) | ~~^~~~~~~~~~~~~