Compilare: main.cpp: In function 'int main()': main.cpp:102:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int it=0;it<buc[bk].size();it++) ~~^~~~~~~~~~~~~~~ main.cpp:125:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int it=0;it<buc[i].size();it++) ~~^~~~~~~~~~~~~~ main.cpp:68:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&n,&q); ^ main.cpp:73:39: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&mat[i][j]); ^ main.cpp:89:65: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d %d %d",&qer.x1,&qer.y1,&qer.x2,&qer.y2); ^