Compilare: main.cpp: In function 'int main()': main.cpp:50:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= sol.size(); i++) { ~~^~~~~~~~~~~~~ main.cpp:11:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("mutari.in", "r", stdin); ^ main.cpp:12:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("mutari.out", "w", stdout); ^ main.cpp:13:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:15:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^