Compilare: user.cpp: In function ‘int main()’: user.cpp:70:64: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d %d %d %d", &task, &N, &st, &dr, &d[side][1]); ^ user.cpp:75:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &val); ^ user.cpp:113:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("summax.out", "w", stdout); ^ user.cpp:20:15: warning: ‘time’ may be used uninitialized in this function [-Wmaybe-uninitialized] tmp = (ll)a + b; ^ user.cpp:103:7: note: ‘time’ was declared here int time; ^