Compilare: user.cpp: In function ‘void BuildGraph()’: user.cpp:72:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < ver[i].size() - 1; j++) gr[ver[i][j]].emplace_back(ver[i][j + 1], 0); ^ user.cpp: In function ‘void DequePushBack(int, int)’: user.cpp:101:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(deq_left[id] < deq[id].size() && dp_go[x] <= dp_go[deq[id].back()]) deq[id].pop_back(); ^ user.cpp: In function ‘void DequePopFront(int, int)’: user.cpp:106:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(deq_left[id] < deq[id].size() && root_time[deq[id][deq_left[id]]] > pop_time) ^ user.cpp: In function ‘int DequeGetMin(int)’: user.cpp:111:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(deq_left[id] < deq[id].size()) return deq[id][deq_left[id]]; ^ user.cpp: In function ‘int main()’: user.cpp:163:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trenuri.in", "r", stdin); ^ user.cpp:164:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trenuri.out", "w", stdout); ^