Compilare: main.cpp: In function 'void inter(int)': main.cpp:47:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<rev[node].size(); ++i) pq.push({sol[rev[node][i].first][0]+rev[node][i].second, i}); ~^~~~~~~~~~~~~~~~~ main.cpp:51:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ind[next]+1==sol[next].size()) continue; ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:16:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pitici.in", "r", stdin); ^ main.cpp:17:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pitici.out", "w", stdout); ^ main.cpp:18:24: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(c, 30, stdin); p=-1; ^ main.cpp:22:28: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(c, 30, stdin); p=-1; ^