Compilare: user.cpp: In function ‘int main()’: user.cpp:35:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d", &n, &m); ^ user.cpp:37:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &h[i]); ^ user.cpp:40:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &q); ^ user.cpp:42:45: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d%d%d", &a, &b, &c, &d); ^ user.cpp: In function ‘long long int sol(int, int, int)’: user.cpp:27:47: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] return 1LL * s[sol] - s[c1 - 1] + 1LL * (c2 - sol) * l; ~~~~^~~~~~