Compilare: user.cpp: In function ‘int check(int, int, int)’: user.cpp:62:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(deq[nod].size() > pos[nod] && deq[nod][pos[nod]].second < t - dst) { ~~~~~~~~~~~~~~~~^~~~~~~~~~ user.cpp:69:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(deq[nod].size() > pos[nod]) { ~~~~~~~~~~~~~~~~^~~~~~~~~~ user.cpp:78:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(deq[nod].size() > pos[nod] && deq[nod].back().first >= dp[id]) { ~~~~~~~~~~~~~~~~^~~~~~~~~~ user.cpp: In function ‘char nextch()’: user.cpp:15:34: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, MAXBUF, fi); ^