Compilare: main.cpp: In function 'void solve(std::vector<std::pair<int, int> >&, int (*)[305][305])': main.cpp:18:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= a.size() ; ++i){ ~~^~~~~~~~~~~ main.cpp:14:9: warning: unused variable 'nr' [-Wunused-variable] int nr = a.size() / 2; ^~ main.cpp: In function 'int main()': main.cpp:54:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pitmutare.in", "r", stdin); ^ main.cpp:55:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pitmutare.out", "w", stdout); ^ main.cpp:57:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &s); ^ main.cpp:61:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^ main.cpp:69:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &x); ^