Compilare: main.cpp: In function 'int main()': main.cpp:37:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("rangemode.in", "r", stdin); ^ main.cpp:38:43: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("rangemode.out", "w", stdout); ^ main.cpp:42:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &n, &m); ^ main.cpp:48:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &v[i]); ^ main.cpp:51:43: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d", &q[i].st, &q[i].dr); ^ main.cpp:121:39: warning: 'elmax' may be used uninitialized in this function [-Wmaybe-uninitialized] else if(cf[v[j]] == maxap && v[j] < elmax) ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~