Compilare: main.cpp: In function 'int main()': main.cpp:34:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < v[i].size(); j++) { ~~^~~~~~~~~~~~~ main.cpp:47:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < aux[i].size(); j++) { ~~^~~~~~~~~~~~~~~ main.cpp:10:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("copii2.in", "r", stdin); ^ main.cpp:11:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("copii2.out", "w", stdout); ^ main.cpp:12:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &k); ^