Compilare: main.cpp: In function 'int main()': main.cpp:40:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int sh = 0; sh < Pab.size(); ++sh) ~~~^~~~~~~~~~~~ main.cpp:12:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("grup.in", "r", stdin); ^ main.cpp:13:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("grup.out", "w", stdout); ^ main.cpp:14:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d", &n, &s, &k1, &k3); ^