Compilare: main.cpp: In function 'int main()': main.cpp:109:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(unsigned int i = 0;i < N - 1; ++i) ~~^~~~~~~ main.cpp:77:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("apm.in","r",stdin); ^ main.cpp:78:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("apm.out","w",stdout); ^ main.cpp:79:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d\n",&N,&M); ^ main.cpp:83:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&x,&y,&c); ^