Compilare: user.cpp: In function ‘int main()’: user.cpp:142:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < pth.size(); ++i) { ^ user.cpp:149:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 1; j < pth[i].size(); ++j) { ^ user.cpp:116:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trenuri2.in" , "r", stdin ); ^ user.cpp:117:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("trenuri2.out", "w", stdout); ^ user.cpp:120:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &q); ^ user.cpp:124:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &x, &y, &d, &v); ^ user.cpp:133:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &x, &y, &v); ^