Compilare: user.cpp: In function ‘void readInput()’: user.cpp:78:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < holder[i].size(); ++k) { ^ user.cpp:79:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = k + 1; j < holder[i].size(); ++j) { ^ user.cpp:35:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &N, &M, &K); ^ user.cpp:44:56: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d", &A, &dec, &B, &ater, &pret); ^ user.cpp: In function ‘int main()’: user.cpp:145:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("avioane2.in", "r", stdin); ^ user.cpp:146:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("avioane2.out", "w", stdout); ^ user.cpp:154:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &node, &t); ^