Compilare: user.cpp: In function ‘void solve(int, int, int)’: user.cpp:90:10: warning: unused variable ‘first’ [-Wunused-variable] bool first = true; ^~~~~ user.cpp: In function ‘void solvetest(FILE*, FILE*)’: user.cpp:123:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &s); ^ user.cpp:125:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &v[i]); ^ user.cpp: In function ‘int main()’: user.cpp:145:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &t); ^