Compilare: main.cpp: In function 'int main()': main.cpp:65:79: warning: self-comparison always evaluates to true [-Wtautological-compare] if(i>0 && v[i].pereche.cur==v[i-1].pereche.cur && v[i].pereche.nxt==v[i].pereche.nxt) ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~ main.cpp:47:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] { freopen("substr.in", "r", stdin); ^ main.cpp:48:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("substr.out", "w", stdout); ^ main.cpp:50:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n", &n, &k); ^ main.cpp:55:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s); ^