Compilare: user.cpp: In function ‘void solve(int)’: user.cpp:124:62: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < rds[nxt].size(); j++) ^ user.cpp:142:62: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < rds[nxt].size(); j++) ^ user.cpp:99:9: warning: unused variable ‘P’ [-Wunused-variable] int P = edg[nod].size(); ^ user.cpp: In function ‘int main()’: user.cpp:220:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < pr.size(); i++) ^ user.cpp: In function ‘char gchar()’: user.cpp:20:38: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, buffer, 1, stdin); ^ user.cpp: In function ‘int main()’: user.cpp:176:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mesaj3.in", "r", stdin); ^ user.cpp:177:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mesaj3.out", "w", stdout); ^