Compilare: user.cpp: In function ‘int main()’: user.cpp:52:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int r = 0; r < a[l][k].size(); r++){ ^ user.cpp:29:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(pf, "%d", &T); ^ user.cpp:31:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(pf, "%d %d %d", &N, &M, &K); ^ user.cpp:32:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(pf, "%d", &P); ^ user.cpp:39:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(pf, "%d %d %d", &an, &n, &m); ^ user.cpp:43:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(pf, "%d", &Q); ^ user.cpp:49:49: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(pf, "%d %d %d %d", &xs, &ys, &xe, &ye); ^